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Sentry/Dash cam card deleted

Had near miss and wanted to capture the idiot only to find that the dashcam icon was missing.

USB audio card on separate card but same USB reader working fine.

Just checked card in Win 10 machine only to find a blank 'disc' called 'USB Drive' - no TeslaCam folder, but Fat 32 formatted otherwise clean. Less than 30 minutes before it had been happy in car with dashcam icon and recording sentry events.

A previously used card, recently reformatted, named and working happily as dash and sentry recorder.

So looks like car had wiped the card clean at some point on its last journey.

Anyone else had this?
Its SD endurance from a reputable source so one would hope it would last more than a couple of weeks. I've got a second identical card from same source that I rotate - thats worked fine.

I'm thinking it may be down to how it was formatted - Ridgecrop on Windows 10 (a recommended method) or a faulty card. This is second time i've formatted this card, both full formats. First time a top level folder got deleted (that was there in additional to TeslaCam folder) and some of the contents inside TeslaCam got corrupted. So I did a second full format to clear.
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